Process of dyeing filaments and films formed from viscore



so the problem of removing sulp 5-torily colored by sul ?a'feuied $112225 21, 1927.

uuirs sTATEs PAT WILLIAM mumssm, or

BEVERLY, NEW JERSEY, T617; QF EDGEWATER PAEE,

No Drawing.

Filaments sud films are ordinarily formedby coagulating Viscose (sulphocarbonute) to cellulose hydrate by suitable chemical solut.ions, snd such products may be satisfachur dyes and dyes of other classes, preferulily what are known as v direct dyes, but all of the dyes ordinarily employed for that purpose are unfavor affected either by alkali or acid, or sulphur bearing compounds, either in the viscose or used in treatment of the filament subsequent to coagulation. Therefore, ulthou h it has u long been recognized to be desirab e todye said tri-sodium-phosphatein aqueous solution before 'subjectin solutiou including such tri-sodiu'm' such filaments and films (luring the process dilliculties in the Way of such accomplishment have heretofore 'proven insurmountable, because any attem t to dye such products duringtheir menu acture is defeated by interference of alkali orecid or sulphur or sulphur bearing compounds carried by the products Therefore, ,eu object and effect of my in vention is to provide a method and means whereby such cellulose hydrate products may be successfully dyed during their process of manufacture.

After an extended research both for a solution to the problem of dyeing aforesaid and urous impurities from the coagulated and precipitated cellulose hydrate; I have discovered that the action of P0 ions of tric-sodiu'm phosphoto (15121 1 0 on thecellulose hydrate either revious to or coincident with, the dyeing -0 the latter, removes all of thecomv plexes injurious to direct dyes, i. e. dyes which ere efiective without the use of a mordunt, or special alkaline or acid solutions; and, that, therefore, the impure cellulose hydrate filaments mi films may be jsatisfactorflyadyed by either treating them with them to the action of the'dye or bytrectmg them with a, single phosphoto and the-dye. j. V This application includes claims limited to the first. named procedure and the other alternative procedure aforesaid is claimed in my copendmg application Serial'No. 32451.-

filed May 23, 1925. As an exam 1e of'the species of my inventiou herein c aimed; I coagulate viscose to'form a filament, of impure cellulose hydrate, by any suitable means of-nmnuat'scture; so for as Tom aware, the

s umion filed Hey 28, 1925. "Serial ire. sc,sso.

and subject said filsmeu't to the action of tri-sodium phosphate by immersing it not three per cent aqueous solution thereof, say, at from 50 to 109 1, for one and half to t'wo hours. certain direct-d higher temperature sfores tain sulphur dyes are temperatures. is to change to soluble form the free sulpbur and insoluble sulphides which are left in and'adhereut upon the rum by the ordinary coagulating process. Such treatment of the filament with tad-sodium pho" is preferably immediately followed by rinseid, Whereas, oer more effective at lower ing the filament with water to eliminate therefrom the sulphur bearing impurities thus rendered soluble. However, the filement may be sul'ijecsed to the action of the dye'without such Washing. As an example of a dyeing operutiou; 1' form one aqueous solution of two per cent of direct block dye such perceotuge beings; calculated with relerezoce to the dry Weight of the finished filaments, and hold the letter in such dyeing bath until it is exhausted. However, as above contemplated, I may use the trisodium It may be observed that 1 yes are more efiicieut at the,

The effect of such treatises:-

phosphate with the dye in the some solution,

Therefore, 3: desire to broadly claim any plication of tri'sodium phosphste (Ne l to coagulate-d or precip' cose, either before, or While such cellulose products ore being subjected to acticsof. d e, and vbefore such producfs hove been drier Therefore, 1 do not desire to limit all of? my claims to the specific details of the pro cedure herein coutempisted, as it is obvious that various modifications may be made therein Without dispersing. from the essential features of my invention, as deliued in the appended claims claim:

l. The method of manufacturing dyed or ticles from viscose (sulphcccrhoustel which consists in subjee 'siug viscose to the sctiou of a coa ulatiiw material and trisodium vphosphote {ElmPOJ and or eclyeing ele i ment in aqueous solution before drying such .articlw.

D 2. The method of menufaoturing dyed erticles from viscose {sulpliocerbouate} which consists in subjecting viscose to the action of a, c'oagulotin material and of ,t'ri-sodium phosphate euPO sud subsequently dye- 1 ar zicles bafare primarily drying ha method of manufacturing dyed ar- *r0m 718C050 (sulphocarbonate) whlch J3 wnsists in subjecting viscose to the fiction of pmducts which consists in subjecting them, before dryin to the acfilix'm of tri-sadium ph0sphate an a direct dye 5. The precass of treating precipitated viscose products which consist in subwcting them, before drying, to the action of tri-so- 35 dium phosphate and a dye.

In testimony wheresf, I have hareunta signed my name at Burlingfion, New Jersey, this 20th day of May, 1925., v 4

WE'LL- M MENDEL. 

